--- a/Src/subst.c +++ b/Src/subst.c @@ -2337,7 +2337,7 @@ paramsubst(LinkList l, LinkNode n, char **str, int qt, int pf_flags, val = aval[0]; isarr = 0; } - s = dyncat(val, s); + s = val ? dyncat(val, s) : dupstring(s); /* Now behave po-faced as if it was always like that... */ subexp = 0; /*